I didn't check that thread, but I will guess using my memory, the Detective Conan is NotATether, the bald guy is ABCbits, the one who wear Metawin signature is iv4n.
The idea is good, but it will not work like it should be.
People will be able to discern who is who based on avatars, merit count, merit history, signature, rank, and probably other things. The point is a random username won't do much if people can still find out who is who IMO. You would need to randomize everything.
And if you have randomize everything, you will lose your reputation you built.
This is a bad thing for someone who make money in this forum, except they don't want to participate in campaign, not have any service and don't care about everything.